An anonymous reader writes: Symantec researchers have discovered an older version of the infamous Stuxnet worm that caused the disruption at Iran's nuclear facility in Natanz: Stuxnet 0.5. According to a whitepaper released by the researchers at RSA Conference 2013, Stuxnet 0.5 has first been detected in the wild in 2007 when someone submitted it to the VirusTotal malware scanning service, but has been in development as early as November 2005. Unlike Stuxnet versions 1.x that disrupted the functioning of the uranium enrichment plant by making centrifuges spin too fast or too slow, this one was meant to do so by closing valves.

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